Infinium WELD STAR WS-MU4-1 User manual

2
Introducon to your new product
Thank you for selecng this Weld Star Innium product.
This product manual has been designed to ensure that you get the most from your new Weld Star
product. Please ensure that you are fully conversant with the informaon provided paying parcular
aenon to the safety precauons. The informaon will help protect yourself and others against the
potenal hazards that you may come across.
Please ensure that you carry out daily and periodic maintenance checks to ensure years of reliable and
trouble free operaon.
Please call your Weld Star distributor in the unlikely event of a problem occurring.
Please record below the details of your new Weld Star product as these may be required for warranty
purposes should you require assistance or spare parts.
Date purchased ________________________________________
Purchased from ________________________________________
Model name ________________________________________
Serial number ________________________________________
(The serial number is normally located on the product packaging, top or underside of the machine)
Disclaimer
Whilst every eort has been made to ensure that the informaon contained within this
manual is complete and accurate, no liability can be accepted for any errors or omissions.
Please note:
Products are subject to connual development and may be subject to change without
noce. www.weldstar.uk
No part of this manual may be copied or reproduced by any means without the wrien
permission of Wilkinson Star Limited.

3
CONTENTS
Page
Your New Product 2
Index 3
Safety Instrucon 4
General electrical and operang safety 4
PPE and Welding processes lens shade selector guide 5
Fume and welding gases and re risks 6
The working environment, Magnec elds and cylinder safety 7
Noise and re awareness, hot parts and RF/LF declaraons 8
Materials and their disposal 9
Package Contents and Unpacking 9
Product Overview 10
Product Technical Specicaons 11
Descripon of Controls 12
Installaon Informaon 14
Display Interface Explained 16
Operaon - MIG/MAG 18
Operaon - TIG 23
Operaon - MMA 29
Guide to MIG/MAG Welding 32
Guide to TIG Welding 41
Guide to MMA Welding 55
Sengs 60
Remote Control (Wired) 61
Remote Control (Wireless) 63
Maintenance 64
Service Schedule 64
Troubleshoong 65
Error Codes 66
Electrical Schemac 67
WEEE Disposal 68
RoHS Compliance Declaraon 68
UKCA Declaraon of Conformity 68
EC Declaraon of Conformity 69
Statement of Warranty 70
Opons and Accessories 71
Memory Storage 71
Notes 72
Weld Star Contact Details 74

4
SAFETY INSTRUCTIONS
These general safety norms cover both arc welding machines and plasma cung
machines unless otherwise noted. The user is responsible for installing and operang
the equipment in accordance with the enclosed instrucons.
It is important that users of this equipment protect themselves and others from harm, or even death.
The equipment must only be used for the purpose it was designed for. Using it in any other way could
result in damage or injury and in breach of the safety rules.
Only suitably trained and competent persons should operate the equipment.
Pacemaker wearers should consult their doctor prior to using this equipment.
PPE and workplace safety equipment must be compable for the applicaon of the work involved.
Always carry out a risk assessment before carrying out any welding or cung acvity.
General electrical safety
The equipment should be installed by a qualied person and in accordance with current
standards in operaon.
It is the users responsibility to ensure that the equipment is connected to a suitable power
supply. Consult your ulity supplier if required.
Do not use the equipment with the covers removed. Do not touch live electrical parts or parts
which are electrically charged. Turn o all equipment when not in use.
In the case of abnormal behaviour of the equipment, the equipment should be checked by a suitably
qualied service engineer.
If earth bonding of the work piece is required, bond it directly with a separate cable with a current
carrying capacity capable of carrying the maximum capacity of the machine current.
Cables (both primary supply and welding) should be regularly checked for damage and overheang.
Never use worn, damaged, under sized or poorly jointed cables.
Insulate yourself from work and earth using dry insulang mats or covers big enough to prevent any
physical contact.
Never touch the electrode if you are in contact with the work piece return.
Do not wrap cables over your body.
Ensure that you take addional safety precauons when you are welding in electrically hazardous
condions such as damp environments, wearing wet clothing and metal structures.
Try to avoid welding in cramped or restricted posions.
Ensure that the equipment is well maintained. Repair or replace damaged or defecve parts immediately.
Carry out any regular maintenance in accordance with the manufacturers instrucons.
The EMC classicaon of this product is class A in accordance with electromagnec compability
standards CISPR 11 and IEC 60974-10 and therefore the product is designed to be used in industrial
environments only.
WARNING: This class A equipment is not intended for use in residenal locaons where the electrical
power is provided by a public low-voltage supply system. In those locaons it may be dicult to ensure
the electromagnec compability due to conducted and radiated disturbances.
General operang safety
Never carry the equipment or suspend it by the carrying strap or handles during welding.
Never pull or li the machine by the welding torch or other cables.
Always use the correct li points or handles. Always use the transport under gear as
recommended by the manufacturer.
Never li a machine with the gas cylinder mounted on it.
If the operang environment is classied as dangerous, only use S-marked welding equipment with a safe
idle voltage level. Such environments may be for example: humid, hot or restricted accessibility spaces.

5
SAFETY INSTRUCTION
Use of Personal Protecve Equipment (PPE)
Welding arc rays from all welding and cung processes can produce intense, visible and
invisible (ultraviolet and infrared) rays that can burn eyes and skin.
• Wear an approved welding helmet ed with an appropriate
shade of lter lens to protect your face and eyes when
welding, cung or watching.
• Wear approved safety glasses with side shields under your
helmet.
• Never use any equipment that is damaged, broken or faulty.
• Always ensure there are adequate protecve screens or
barriers to protect others from ash, glare and sparks from
the welding and cung area.
• Ensure that there are adequate warnings that welding or
cung is taking place.
• Wear suitable protecve ame resistant clothing, gloves and
footwear.
• Ensure adequate extracon and venlaon is in place prior to
welding and cung to protect users and all workers nearby.
• Check and be sure the area is safe and clear of ammable material before carrying out any welding or
cung.
Some welding and cung operaons may produce noise. Wear safety ear protecon to protect your
hearing if the ambient noise level exceeds the local allowable limit (e.g: 85 dB).
Welding and Cung Lens Shade Selector Guide
Current MMA
Electrodes
MIG
Light Alloys
MIG
Heavy Metals MAG TIG Plasma Cung
Plasma
Welding
Air Arc
Gouging Current
10 8
10 10 10
9
11
10
10
10
15 15
20
9
20
30 10 11 30
40 40
60 10 11 60
80
12
80
100
11 11
11 100
125
11 12
125
150 12
13
150
175
12
175
200
12
12
12 13
13 11 200
225 225
250 12 250
275 13
14 14
275
300
13
13 300
350
13 14 13 14
350
400 14 400
450 450
500 14 15 14 15 15 500

6
SAFETY INSTRUCTION
Safety against fumes and welding gases
The HSE have idened welders as being an ‘at risk’ group for occupaonal diseases arising
from exposure to dusts, gases, vapours and welding fumes. The main idened health eects
are pneumonia, asthma, chronic obstrucve pulmonary disease (COPD), lung and kidney
cancer, metal fume fever (MFF) and lung funcon changes.
During welding and hot cung ‘hot work’ operaons, fumes are produced which are
collecvely known as welding fume. Depending upon the type of welding process being performed, the
resultant fume generated is a complex and highly variable mixture of gases and parculates.
Regardless of the length of welding being carried out, all welding fume, including mild steel welding
requires suitable engineering controls to be in place which is
usually Local Exhaust Venlaon (LEV) extracon to reduce the
exposure to welding fume indoors and where LEV does not
adequately control exposure it should also be enhanced by using
suitable respiratory protecve equipment (RPE) to assist with
protecng against residual fume.
When welding outdoors appropriate RPE should be used.
Prior to undertaking any welding tasks an appropriate risk
assessment should be carried out to ensure expected control
measures are in place.
Locate the equipment in a well-venlated posion and keep your head out of the welding fume.
Do not breathe in the welding fume.
Ensure the welding zone is well-venlated and provision should be made for suitable local fume
extracon system to be in place.
If venlaon is poor, wear an approved airfed welding helmet or respirator.
Read and understand the Material Safety Data Sheets (MSDS’s) and the manufacturer’s instrucons for
metals, consumable, coangs, cleaners and de-greasers.
Do not weld in locaons near any de-greasing, cleaning or spraying operaons.
Be aware that heat and rays of the arc can react with vapours to form highly toxic and irritang gases.
For further informaon please refer to the HSE website www.hse.gov.uk for related documentaon.
Precauons against re and explosion
Avoid causing res due to sparks and hot waste or molten metal.
Ensure that appropriate re safety devices are available near the welding and cung area.
Remove all ammable and combusble materials from the welding, cung and surrounding
areas.
Do not weld or cut fuel and lubricant containers, even if empty. These must be carefully
cleaned before they can be welded or cut.
Always allow the welded or cut material to cool before touching it or
placing it in contact with combusble or ammable material.
Do not work in atmospheres with high concentraons of combusble
fumes, ammable gases and dust.
Always check the work area half an hour aer cung to make sure that
no res have begun.
Take care to avoid accidental contact of the torch electrode to metal
objects, as this could cause arcs, explosion, overheang or re.
Know and understand your re exnguishers
An example of personal fume protecon

7
SAFETY INSTRUCTION
The working environment
Ensure the machine is mounted in a safe and stable posion allowing for cooling air circulaon.
Do not operate equipment in an environment outside the laid down operang parameters.
The welding power source is not suitable for use in rain or snow.
Always store the machine in a clean, dry space.
Ensure the equipment is kept clean from dust build up.
Always use the machine in an upright posion.
Protecon from moving parts
When the machine is in operaon keep away from moving parts such as motors and fans.
Moving parts, such as the fan, may cut ngers and hands and snag garments.
Protecons and coverings may be removed for maintenance and managed only by qualied
personnel aer rst disconnecng the power supply cable.
Replace the coverings and protecons and close all doors when the intervenon is nished and before
starng the equipment.
Take care to avoid geng ngers trapped when loading and feeding wire during set up and operaon.
When feeding wire be careful to avoid poinng it at other people or towards your body.
Always ensure machine covers and protecve devices are in operaon.
Risks due to magnec elds
The magnec elds created by high currents may aect the operaon of pacemakers or
electronically controlled medical equipment.
Wearers of vital electronic equipment should consult their physician before beginning any arc
welding, cung, gouging or spot welding operaons.
Do not go near welding equipment with any sensive electronic equipment as the magnec
elds may cause damage.
Keep the torch cable and work return cable as close to each other as possible throughout their length.
This can help minimise your exposure to harmful magnec elds.
Do not wrap the cables around the body.
Handling of compressed gas cylinders and regulators
Mishandling gas cylinders can lead to rupture and the release of high pressure gas.
Always check the gas cylinder is the correct type for the welding to be carried out.
Always store and use cylinders in an upright and secure posion.
All cylinders and pressure regulators used in welding operaons should be handled with care.
Never allow the electrode, electrode holder or any other electrically “hot” parts to touch a
cylinder.
Keep your head and face away from the cylinder valve outlet when opening the cylinder valve.
Always secure the cylinder safely and never move with regulator and hoses connected.
Use a suitable trolley for moving cylinders.
Regularly check all connecons and joints for leaks.
Full and empty cylinders should be stored separately.
Never deface or alter any cylinder

8
SAFETY INSTRUCTIONS
Fire awareness
The cung and welding process can cause serious risks of re or explosion.
Cung or welding sealed containers, tanks, drums or pipes can cause explosions.
Sparks from the welding or cung process can cause res and burns.
Check and risk assess the area is safe before doing any cung or welding.
Venlate all ammable or explosive vapour from the workplace.
Remove any and all ammable materials away from the working area. If necessary, cover ammable
materials or containers with approved covers (following manufacturers instrucons) if unable to remove
from the immediate area.
Do not cut or weld where the atmosphere may contain ammable dust, gas or liquid vapour.
Always have the appropriate re exnguisher nearby and know how to use it.
Hot parts
Always be aware that material being cut or welded will get very hot and hold that heat for a
considerably long me which will cause severe burns if the appropriate PPE is not worn.
Do not touch hot material or parts with bare hands.
Always allow for a cooling down period before working on material recently cut or welded.
Use the appropriate insulated welding gloves and clothing to handle hot parts to prevent burns.
Noise awareness
The cung and welding process can generate noise that can cause permanent damage to your
hearing. Noise from cung and welding equipment can damage hearing.
Always protect your ears from noise and wear approved and appropriate ear protecon if
noise levels are high.
Consult with your local specialist if you are unsure how to test for noise levels.
RF Declaraon
Equipment that complies with direcve 2014/30/EU concerning electromagnec compability
(EMC) and the technical requirements of EN60974-10 is designed for use in industrial buildings
and not for domesc use where electricity is provided via the low voltage public distribuon
system.
Dicules may arise in assuring class A electromagnec compability for systems installed in domesc
locaons due to conducted and radiated emissions.
In the case of electromagnec problems, it is the responsibility of the user to resolve the situaon.
It may be necessary to shield the equipment and t suitable lters on the mains supply.
LF Declaraon
Consult the data plate on the equipment for the power supply requirements.
Due to the elevated absorbance of the primary current from the power supply network, high
power systems aect the quality of power provided by the network. Consequently, connecon
restricons or maximum impedance requirements permied by the network at the public network
connecon point must be applied to these systems.
In this case, the installer or the user is responsible for ensuring the equipment can be connected,
consulng the electricity provider if necessary.

9
SAFETY INSTRUCTION
Materials and their disposal
Welding equipment is manufactured with BSI published standards meeng CE requirements for
materials which do not contain any toxic or poisonous materials dangerous to the operator.
Do not dispose of the equipment with normal waste.
The European Direcve 2012/19/EU on Waste Electrical and Electronic Equipment states that electrical
equipment that has reached its end of life must be collected separately and returned to an
environmentally compable recycling facility for disposal.
For more detailed informaon please refer to the HSE website www.hse.gov.uk
PACKAGE CONTENTS AND UNPACKING
Supplied within your new Weld Star Innium product package will be the following items with each
model.
Use care when unpacking the contents and ensure all items are present and not damaged.
If damage is noted or items are missing, please contact the supplier in the rst instance and before
installing or using the product.
Record the product model, serial numbers and purchase date in the informaon secon found on the
inside front page of this operang manual.
Weld Star WS-MU4-1 ACDC LCD
Weld Star MU4-1 Power Source
Titanium T240 3M MIG Torch (T240-3)
Titanium 26 Tig Torch 12 (TIG-103)
MMA work lead
Work Return Lead
Gas Regulator
Gas Hose
0.8mm/1.0mm V feed roll
USB Sck including Operang Manual
Please Note:
• You may note that the package contains 2 spare brackets, if so, these are only required if you have
or do purchase the Weld Star 2 wheel trolley WS-T2.
These brackets allow the MU4-1 machine to be secured to the trolley shelf.
• Package contents may very depending on country locaon and package part number purchased.

10
PRODUCT OVERVIEW
The Weld Star MU4-1 is a true mul-process inverter welder oering professional welding performance
in all processes and is the rst of its kind to include pulse technology in MIG, TIG and MMA, making it
the most versale machine on the market today.
It has been designed to incorporate the most advanced features and technology
oering the operator a user-friendly interface via the 5” true colour LCD display.
Welding process’s include:
 MIG/MAG Synergic
 MIG/MAG Pulse
 MIG/MAG Standard
 TIG AC (HF/LIFT)
 TIG DC (HF/LIFT)
 MMA AC
 MMA DC
Weld Star Plasma WS-MU4-1 Product Features:
• Advanced IGBT mul-process inverter technology which
is compact and lightweight at only 20kg
• PFC technology oering mulple advantages such as energy
eciency and wide range input voltage from 95Vac – 265Vac
• Wired and wireless remote control opons
• Generator friendly
• Smart fan – reduces power consumpon and intake of dust and fumes
• IP23 protecon
• Built to EN-60974-1 and is fully compliant with the European Commission Regulaon 2019/1784,
CE and UKCA
• With synergic MIG/MAG, welding parameters can be automacally selected based on material
thickness and voltage with synergic curves for common materials and wires
• Integrated TIG welding features such as HF or li TIG, pre/post ow gas mes, 2T/4T, slope up/down
and pulse, all to ensure excellent TIG welding characteriscs in both AC and DC
• SMART TIG funcon with advanced TIG welding features, such as mul-wave, Q start and hybrid TIG,
whilst sll maintaining ease of set up for the user
• DC and AC MMA suitable for a wide range of electrodes
• Advanced MMA features such as pulse and automac current regulaon based on electrode
diameter
• Hot start arc ignion funcon which ensures excellent arc ignion in MMA for easier and more
reliable arc starng
• Self adapve arc force technology which maintains MMA arc condions during operaon even with
long welding cables
• In-built VRD (MMA and TIG mode only)
• Designed for gas and gasless MIG welding wires.
• Ability to save up to 10 stored programs for quick set up
• Advanced error code menu for ease of fault and troubleshoong diagnosis
• Panel mounted USB connecon for quick and easy rmware updates
• Available with a wide range of accessories including on torch remote, foot pedal, spool on gun
and 2 wheel trolley

11
TECHNICAL SPECIFICATIONS
Parameter Unit Weld Star WS-MU4-1
Rated input voltage V
Wide Voltage 95Vac – 265Vac
AC110V (±15%) 50/60Hz AC230V (±15%) 50/60Hz
Rated input power kVA 4.5 7.5
Rated input current Imax A
MIG 35
TIG AC 31.5 / DC 33
MMA AC 36.5 / DC 39.5
MIG 28
TIG AC 21 / DC 22.5
MMA AC 30.5 / DC 33.5
Rated input current Ie A
MIG 17.5
TIG AC 16 / DC 16
MMA AC 18.2 / DC 19.7
MIG 14
TIG AC 10 / DC 11
MMA AC 15 / DC 17
Welding current range A
MIG 10 ~ 140
MMA 5 ~ 130
TIG 5 ~ 160
MIG 40 ~ 200
MMA 5 ~ 200
TIG 5 ~ 200
No-load voltage V
MIG 28
MMA 75
TIG 75
Rated duty cycle (40°C) %
MIG 140A @ 25%
MMA AC/DC 130A @ 25%
TIG AC/DC 160A @ 25%
MIG 200A @ 25%
MMA AC/DC 200A @ 25%
TIG AC/DC 200A @ 25%
Eciency %85
Idle state power W30
Power factor cosφ0.99
Standard - EN60974-1
Protecon class IP IP23
Insulaon class - H
Noise db <70
Humidity %<90% (20°C)
Operang temperature range °C -10 ~ +40
Storage temperature °C -25 ~ +55
MIG Torch - Titanium T240 3m
MIG recommended wire size mm FE: 0.6/0.8/1.0 - SS: 0.8/1.0 - Flux Cored: 0.6/0.8/1.0
Wire reel weight/spool size kg/mm 5kg / 200mm
MMA recommended
electrode size mm 1.6 ~ 3.2 1.6 ~ 4.0
Overall size mm 620 X 220 X 370 (without handle)
620 X 220 X 430 (with handle)
Weight kg 20

12
CONTROLS
Front view Weld Star WS-MU4-1
1. Protecve control panel cover
2. Control panel (see below and page 16 for further informaon)
3. Posive ‘+’ Dinse socket outlet (35/50mm)
4. MIG Torch outlet connector, the connecon that allows for a euro
style MIG torch to be ed
5. 9 Pin remote control socket (12 pin on early models) see page 61
for further informaon
6. Cooling air vent
7. TIG gas outlet (10mm)
8. Negave ‘-’ Dinse socket outlet (35/50mm)
Rear view Weld Star WS-MU4-1
9. Protecve control panel cover
10. Carry handle
11. Gas inlet
12. Air vent
13. Mains power ON/OFF switch
14. Mains input power cable
Control panel view Weld Star WS-MU4-1
27 USB Connector *
28 5” Digital screen
29 Le control buon
30 Main control dial and acvaon buon
31 Right control buon
* The front panel USB socket allows for easy
soware updates to be loaded into the machine.
By inserng a ‘loaded’ Weld Star USB while the
machine is turned o and then switching the
machine ON will the machine automacally load
the updated rmware and programs (during this mode the screen displays the rmware update status).
Once the update is complete the machine will boot up as normal.

13
CONTROLS
Side view Weld Star WS-MU4-1
15. Carry handle
16. Rear panel (see page 12 for further informaon).
17. Wire spool holder and tensioner: Allows a 5kg (200mm diameter) reel of wire to be located in place
via an alignment pin and then locked in place with the locking nut. The spool holder also has a brake
arrangement to ensure correct tension of the wire, this is done by turning the central bolt with an
allen key clockwise (to ghten) or an clockwise (to loosen).
18. Rear air vent.
19. Protecve control panel cover.
20. Adjustment point to euro MIG torch outlet polarity to be either posive ‘+’ or negave ’–’.
When using gas set the connecon to ‘+’ when using ‘gasless’ welding wire set the connecon to ‘–’.
21. Control panel (see page 12 and from page 16 for further informaon).
22. Drive Assembly feed motor and gearbox (the feed motor is located behind the plasc cover).
23. Upper pressure roll assembly: Holds the upper drive roll in place which applies pressure to the
welding wire via the ed grooved drive roll, the pressure is applied via the drive roll tensioner which
allows the correct amount of tension to be applied to the top roller to ensure good feed of the wire
through the MIG torch.
24. Outlet feed adaptor: Part of the Euro outlet connector assembly which contains the inner outlet guide
which ensures smooth wire feed from the drive assembly through to the MIG torch.
25. Wire feed roller and retaining nut. Secures and holds the grooved drive roll in place. The feed roll
supplied with the machine is a 0.8mm/1.0mm V
26. Inlet wire guide: The welding wire is fed through the inlet guide prior to feeding through the drive
rollers.

14
INSTALLATION
Unpacking
Check the packaging for any signs of damage.
Carefully remove the machine and retain the packaging unl the installaon is complete.
Locaon
The machine should be located in a suitable posion and environment. Care should be taken to avoid
moisture, dust, steam, oil or corrosive gases.
Place on a secure level surface and ensure that there is adequate clearance around the machine to
ensure natural airow.
Input connecon
Before connecng the machine you should ensure that the correct supply is available. Details of the
machine requirements can be found on the data plate of the machine or in the technical parameters
shown in the manual.
The equipment should be connected by a suitably qualied competent person. Always ensure the
equipment has a proper grounding.
Never connect the machine to the mains supply with the panels removed.
Output connecons
Electrode polarity
In general when using manual arc welding electrodes the electrode holder is connected to the posive
terminal and the work return to the negave terminal. Always consult the electrode manufacturer’s
data sheet if you have any doubts.
MMA welding
Insert the cable plug with electrode holder into the “+” socket on the front panel of the welding
machine and ghten it clockwise.
Insert the cable plug of the work return lead into the “-” socket on the front panel of the welding
machine and ghten it clockwise.

15
INSTALLATION
MIG welding
• Insert the welding torch (B) into the “Euro connector for torch in MIG” output socket on the front
panel of the machine and ghten it into posion.
• Insert the work return lead cable plug (A) into the “-” output terminal of the welding machine and
ghten by rotang it clockwise.
• Ensure that the link (C) the torch polarity connecon link is in the vercal posion and connected to
the “+” terminal, this ensure that’s the MIG torch polarity is posive (+).
• Install the welding wire on the spindle adapter (I).
• Connect the cylinder (H) equipped with the gas regulator (D) to the gas inlet on the back panel of the
machine (E) with a gas hose.
• Ensure that the wire groove size of the ed drive roll matches the contact p (ed to the MIG
torch) and the welding wire size being used.
• Release the pressure arm of the wire feeder to thread the wire through the guide tube and into the
drive roll groove and then adjust the pressure arm, ensuring no sliding of the wire. (too much pressure
will lead to wire distoron which will aect wire feeding).
• Turn the machine ON
• Via the user display, place the welding mode funcon into the MIG posion (see page 16).
• ‘Inch’ the welding wire through the MIG torch and out via the contact p (see page 16).
• You are now ready to start MIG welding.
Gasless self shielded MIG welding
When carrying out MIG welding with gasless welding wire the welding torch polarity is reversed, so the
MIG torch is ‘-’ and the work return lead is ‘+’
Follow the above procedure except for the following:
• Insert the work return lead cable plug (A) into the “+” output terminal of the welding machine and
ghten by rotang it clockwise.
• Ensure that the link (G) the torch polarity connecon link is in the horizontal posion and connected
to the “-” terminal, this ensure that’s the MIG torch polarity is now negave (-).
• Ensure that you have turned OFF the gas supply at the cylinder.
A
B

16
MULTIFUNCTIONAL DISPLAY WINDOW
Display Screen Explained WS-MU4-1
Upon powering ON your MU4-1 and boot up sequence is complete, the main menu will appear on the
LCD digital screen ’F’ as shown right, this allows the operator to navigate the various welding processes
by rotang the control dial ‘B’ clockwise or an
clockwise and when the desired opon is front
and centre then you can press the dial ‘B’ to
access the required welding mode.
Along with the sengs opon you can also
navigate yourself though the welding modes
that include: MMA, MIG Pulse, MIG Synergic,
MIG Standard, Li TIG, HF TIG and Smart TIG.
Buon ‘A’ is usually associated with the icon
that’s circled ‘D’ (to access opon short press A).
Buon ‘C’ is usually associated with the icon
that’s circled ‘E’ (to access opon short press C).
Navigate to one of the MIG welding process opons, the example
shown le is MIG manual, you will then note that just above the
control dial circled ‘H’ it shows the polarity of the MIG torch and
work return lead:
• MIG torch symbol is ‘+’ (posive polarity)
• Work return lead clamp is ‘-’ (negave polarity)
To check that the outputs are congured correctly, please check
out pages 15-16 to adjust and set if required.
In this screen you also have the ability to check and acvate gas
purge along with ‘inching’ the wire feed.
• If you long press and release buon ‘A’ (approx. 3 seconds) the gas solenoid will acvate allowing the
gas to purge and ow, allowing you to test and set the gas ow accordingly.
• If you long press and release buon ‘C’ (approx. 3 seconds) this acvates the wire feed motor which
in turn pushes the welding wire through the MIG torch and contact p.
If you press the control dial ‘B’ buon, this will take you to the MIG manual welding process control
screen, as shown le, where you can adjust (in this case being
MIG Manual) the following sengs:
• 1Wire Feed Speed
• 2Welding Voltage
• 3MIG Torch switch control, 2T, 4T, S4, Spot and S2t
• 4Variable MIG Inductance control
To access these advanced seng, press the control dial ‘B’ and
each of the green circled parameters numbered 1 - 4 will highlight
red in turn as you rotate the control dial B.
To adjust a highlighted parameter, press the control dial which
will allow you to adjust selected parameter by rotang the dial and then pressing the control dial again
will store the parameter seng and automacally move to the next parameter opon.
Please Note: Parameter opons vary depending on welding process and torch trigger mode selected.

17
MULTIFUNCTIONAL DISPLAY WINDOW
Display Screen Explained WS-MU4-1 (connued)
As previously noted buons A and C have 2 funcons determined
by either a short or long press of buons A and C.
• Briey pressing buons A or C will acvate the 2 opon icons
circled purple.
• Pressing, holding the releasing buons A and C for approx. 3
seconds will acvate the 2 opon circled in green (save and
load in this case).
Following on from the instrucons on the previous page, if you
press and release (short press) buon ‘C’ you will now enter a
new screen (shown le) that allows the operator to select and
adjust more advanced (in this case) MIG sengs such as:
• Pre gas ow
• Slope up
• Current
• Slope down
• Post gas ow
• Burn back
• Also Start Amps, Start Amps me and nal amps are available
in either S2t or S4t torch trigger mode.
Please Note: These parameter opons do change depending on which welding process and torch trigger
mode you have selected.
Save and Loading welding programs
The following informaon details the save and load opons of welding parameters as detailed below:
Saving a welding program
If you long press (approx. 3 seconds) and release buon ‘A’ the
screen will change to the memory save opon.
As you will see this screen allows the operator to save his setup
to 1 of 10 memory programs.
To save, rotate the control dial to the desired program number
and then press and release buon ‘C’.
Loading a welding program
If you long press and release buon ‘C’ (for approx. 3 seconds)
the screen will change to the memory load opon.
This screen allows the operator to load previously saved welding
programs.
To load a program, rotate the control dial to the desired program
number and then press and release buon ‘C’
You will then return to the loaded welding program screen.

18
OPERATION - MIG/MAG
Before starng any welding acvity ensure that you have suitable eye protecon and
protecve clothing. Also take the necessary steps to protect any persons within the welding
area.
MIG/MAG welding mode
MIG - Metal Inert Gas Welding, MAG - Metal Acve Gas Welding, GMAW - Gas Metal Arc Welding
MIG welding was developed to help meet producon demands of the
war and post war economy which is an arc welding process in which a
connuous solid wire electrode is fed through a MIG welding gun and
into the weld pool, joining the two base materials together.
A shielding gas is also sent through the MIG welding gun and protects
the weld pool from contaminaon which also enhances the arc.
Connect the MIG torch as shown (B)
Work return lead to ‘-’ (A)
Ensure that a suitable inert gas supply is
connected (E).
Switch the power switch on the back panel
to “ON” (F) the machine is started with the
panel display coming ON.
Via the display navigate to welding mode
and set welding mode to MIG or MIG
synergic depending on your applicaon.
Open the gas valve of the cylinder and adjust
the gas regulator to obtain the desired ow rate (D).
Adjust the displays MIG sengs on the machine control panel to get the correct desired welding
condion of welding voltage, current etc (see page 17 for further info on the control panel display
funcon)
Operate the torch trigger and welding can be carried out, (Note: Once the MIG torch switch is pressed, if
no welding current is sensed within 5 seconds, wire feed, gas and output voltage will stop).
The below MIG wire guide can vary depending on material used, work piece thickness, welding posion
and joint form.
MIG - Gasless Welding
The operaon method is the
same as the above MIG
operaon except there are no
gas opons and the output
polarity is reversed (G in above
image).
Please Note:
Before starng any welding acvity ensure that you have suitable PPE including eye protecon and
protecve clothing. Also consider and take the necessary steps to protect any persons within the area.
Wire Diameter DIP Transfer Spray Transfer
(mm) Current (A) Voltage (V) Current (A) Voltage (V)
0.6 30 ~ 80 15 ~ 18 n/a n/a
0.8 45 ~ 180 16 ~ 21 150 ~ 250 25 ~ 33
1.0 70 ~ 180 17 ~ 22 230 ~ 300 26 ~ 35
1.2 60 ~ 200 17 ~ 22 250 ~ 400 27 ~ 35
1.6 100 ~ 280 18 ~ 22 250 ~ 500 30 ~ 40

19
MULTIFUNCTIONAL DISPLAY WINDOW - MIG MODE
Welding screen/display explained MU4-1
Upon powering ON your WS-MU4-1 and boot up is complete, the control panels main menu will appear
on the digital panel as shown above.
You can now navigate yourself though the various opons and welding modes which include:
Sengs, MIG Pulse, MIG Synergic, MIG Manual, Li TIG, HF TIG, Smart TIG and MMA.
In the home screen, for MIG welding the following opons are available:
MIG Pulse MIG Synergic MIG Manual
By rotang the main centre control dial you will ’scroll’ through the opons and by pressing the dial you
will enter either MIG Pulse, MIG Synergic or MIG manual mode.
Convenonal MIG welding equipment (MIG manual) run at a steady single amperage where the operator
has access and controls of the wire feed speed rate and the welding voltage whereas with MIG pulsed
welding the machine runs a peak and a background amperage and the unit will constantly switch between
the two amperages enabling the operator to put out a lower overall heat input into the material.
One of the benets of MIG pulse includes smoother spaer free welding to help prevent blowing through
thin material.
When MIG synergic welding is referred to it means that when a single seng is adjusted (voltage or
material thickness) the other sengs like current or wire speed change automacally.
Please Note:
When in the selecon screens (as above) for MIG welding modes, pressing and holding either the
boom le or the boom right buons will give you the facility of ‘Gas Test’ or ‘Wire Feed Inch’ which
are noted in the top line of the display.

20
MULTIFUNCTIONAL DISPLAY WINDOW - MIG MODE
Welding screen/display explained MU4-1
When selecng either MIG pulse or MIG Synergic mode, the operator has the opon to select material,
gas and wire size as shown below, this selecon is carried out by rotang and pressing the main dial to
select the desired opon.
Material selecon choice is as follows:
• FE - Mild Steel
• Flu.Fe - Flux Cored
• Ss - Stainless Steel
• AlMg - Aluminium Magnesium
Gas selecon choice is as follows:
• 80% Ar 20%C02
• 100% C02
Wire diameter size selecon choice is as follows:
• 0.6mm (0.024)
• 0.8mm (0.032)
• 0.9mm (0.035)
• 1.0mm (0.039)
At this point the bar along to boom of the screen does show the operator welding mode, material, gas
and wire size that have selected.
Once you have selected the key welding setup parameters as shown above, you will now enter the main
welding screen that displays centrally your chosen MIG process, material, gas and wire size.
As the above screens show, the le circular secon oers either current or wire feed seng and the right
secon shows voltage/arc length and these opons can vary depending on which MIG process has been
selected.
The boom row shows, material thickness, torch trigger mode and inductance control and to adjust each
seng, simply press the control dial unl the parameter you wish to adjust is highlighted in red and then
rotate the dial to adjust said parameter, pressing the control dial again stores that parameter seng.
When in Pulse MIG you have an addional feature called ‘Wire retract’ which is only eecve when
welding aluminum material. When ‘Wire Retract’ is set it ON (see page 60), at arc starng the welding
wire will briey retract when rst touching the workpiece and the inial start current is lowered to
enhance weld starng properes. When set to OFF the ’Wire Retract’ feature will not be acve.